The newly developed motor–pump model can be used reliably in designing and calculating the long term performance of a PV water pumping system over any monthly and annual period. The developed motor–pump model leads to an improved way to design and simulate a PV pumping system based on the available data from the manufacturers catalog. Also, the model is proven to be accurate after it was compared with the manufacturers PVCAD program. The water head plays an important role in evaluating the economic feasibility of photovoltaic powered water pumping systems, while tilt angle variations have no remarkable effect on system performance up to a tilt angle equal to latitude ±20. An optimum system parameter search can greatly enhance the performance of a PV pumping system to achieve the required water demand for living in a remote area. A well-designed directly coupled PV pumping systems is feasible in the Kuwait climate even at the current expensive prices of PV modules. The economic feasibility is based on certain assumptions, and the results of the comparison between PV pumping systems and conventional pumping systems will be influenced by changes in any of the key assumptions used, like period of analysis and reliability of the equipment for that period. Costs of PV equipment and water pumps are expected to decrease more and more over the next few years as the demand for PV systems goes up worldwide. These factors will make PV pumping systems more economic in the near future. The results of the present work should encourage governments for wide installation of solar energy systems to keep our environment healthy and clean.